Question
What's the source where I can find a complete list of all currently valid and deprecated comma rules for the German language?
By "deprecated" I mean after the German Orthographic Conference ...

I have a question regarding if I should or should not add a comma in this sentence, just before "zu lernen".
Is it necessary? Is it a must to separate the sentence in two? Would it be incorrect if I ...

Is there a general word to describe a sentence part, such as a relative clause, but also an infinitive clause?
Gibt es ein allgemeines Wort, um Satzteile – zum Beispiel einen Relativsatz, aber auch ...